Workers are seen at the construction site of the National Speed Skating Oval, one of the venues for the 2022 Winter Olympics, in Beijing, China May 21, 2019. Picture taken May 21, 2019. China Daily via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA. - RC1D1C07D0C0